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setting a imagebuttons layout parameters in a class
<ImageButton
    android:src="@drawable/about"
    android:scaleType="fitXY"
    android:padding="0dp"
    android:layout_height="80dp"
    android:layout_width="80dp"
    android:layout_alignParentTop="true"
    android:layout_alignParentRight="true"
    android:id="@+id/about">
    </ImageButton>

Display display = getWindowManager().getDefaultDisplay();

    int swidth = display.getWidth();
    int sheight = display.getHeight();

    RelativeLayout.LayoutParams ablayoutparams = new RelativeLayout.LayoutParams((int)
    (swidth*.1666666) , (int)(sheight*.1));
    about.setLayoutParams(ablayoutparams);